//*-- bars --*\\
.icono-bars{
    width: $U20;
    height: $U2;
    box-shadow: inset 0 0 0 $U32, 0 -1*$U6, 0 $U6;
    margin: $U16 $U7;
}
.icono-hamburger{
    @extend .icono-bars;//will be deprecate
}